function knn2fet(k)
load mnist_knn;
DIS = DIST(:,2:k+1);
DIS = DIS/max(max(DIS));
DIS = exp(-DIS.^2);
B = knn2inc(IDX(:,2:k+1),DIS);
L = B'*B;
[V,~] = eigs(L,101,'sm');
VV = V(:,100:-1:1);
save(['res/',int2str(k),'nn_fet_wet'],'VV');
end